Reamer



March 31.1925. 1,532,040

P. H. coNRADsoN BEAMER Filed April 19, 1924 Patented Mar. 31, 1925.'

UNITED STATES PATENT OFFICE.

IEIKIEIII'.I.I(.'1i H. CONRADSON, OF lCHICAGO, ILLINOIS, ASSIGNOR TOCONRADSON T001)v CORPORATION, 0]?I DETROIT, MICHIGAN.

annum.

Application led April 19, 1924. Serial No. 707,591.

To all rwhom t may concern:

Be it known that I, PRENTICE H. CONRAD soN, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented a certain new and useful Improvement in Reamers,of which the following is a full, clear, concise, and exact description,reference being had to the accompanying drawings, forming 0 a part ofthis specification.

My invention relates to reamers.

One of the objects of the invention lis to provide a practicalandsatisfactory construction of reamer.

Inthe accompanying drawings Fig. 1 is a vertical section cian apparatusfor making reamers embodying my invention, and also an elevation of areamer in said apparatus;

Fig. 2 is a plan view of the same; and Fig. 3 is a side elevation' ofthe reamer itsel Referring to the drawings, I show a reamer comprising ashank 1 and a body portion 2, which latter is. provided with cuttingblades 3 3. The latter vare arranged longitudinally in the body 2 inlongitudinally extending grooves.v

The body 2 is composed of a metal which is hard and strong, but which,melts at a comparatively low temperature, as for exv ample, an aluminumalloy, some of the well space or chamber adaptedto form the body' knownones of which melt around twelve hundred to thirteen hundred degrees F.

The blades 3 3 are of hard tempered steel, having of course 'a highmelting point, whose temper is not affected by the melting pointtemperature of the aluminumdalloys referredto, namely twelve to thirteenh'undred degrees Fahrenheit; The reamer. is formed by casting the shank1 'and body 2 with .the blades 3 3 in it, the aluminum alloy being runin in a melted condition, and the blades 3 3 cast init.

This may be advantageously done byl using a steel mold 4 having, forexample, a base piece 5, and an annular member 6, and a top 7. The base5 has an aperture for the shank l and the annular member'G has a 2, andalso has grooves for the blades 3. The top 7 has slots adapted toreceive and hold the upper ends of blades 3. The top .7 is made in twopieces` 7 and 7", so that it may be readily. laid in position andremoved. A washer 15 is Iplaced upon top 7 so as to keep the two halvestogether. Pins 10 and 1,1 ar employed for holding members 5, 6 and 7 1nproper relative positions.

Thus the reamer may be for-med by setting blades 3 in position in themold, and holding them inrsuch position, and then "Bassum than the pointat which bladetemper will l be aii'ected.

.Thus the reamer will be more light and yet stron effective and durableand the process o making it will be very inexpensive, and the apparatussimple.

It will be understood that changes and modifications may be made withoutdeparting fromr the spirit of the invention.

What I claim is:

1. A metal cutting tool comprising a body the body for more than onehalf their n l9o 2. A metal cuttingtool comprising a body of d-ie castaluminum alloy having a melt- -f ing temperature of approximately 1200degrees to 1300 degrees Fahrenheit and blades of hard tempered steel,the drawing point of the temperbeing above 1400 degrees Fahenheit, saidbod being vcast .on the base portions of4 the' lades, said blades beingembedded in the bodyv for Amore than one E half their depth.

In witness whereof, I'hereunto subscribe my name this 3rd day of April,A. D., 1924;.

PRENTICE H. coNRADsoN.

